If you need a specific color in your photo, use the prompt "Character Reference" (only in engine 6.0)

• find an image of your color online
• save this image
• open Midjourney
• paste your picture into Midjourney (drag and drop) and press "enter" (to upload it)
• save the image as a shortcut: 
  • type in "/prefer option set"
  • add one more option (+)
  • click on " value"
  • drag and drop the image URL into value box
  • name your shortcut in the option box (eg. patagonienrot)
  • use your shortcut in the prompt by adding --cref 
  • add then the name of the shortcut with --patagonienrot
  • keep in mind: --v 6.0
  • optional:
    • lower the character weight (--cw 50)